Johnson County
Also known as Johnson County, Missouri, Johnson County, MO
county in Missouri, United States
Key facts
- Country
- United States
- State
- Missouri
- Founded
- December 13, 1833
- Named after
- Richard Mentor Johnson
- Seat
- Warrensburg
- Largest city
- Warrensburg
- Total
- 833 sq mi (2,160 km )
- Land
- 829 sq mi (2,150 km )
- Water
- 3.9 sq mi (10 km ) 0.5%
- Estimate 2025
- 56,670
- Density
- 68/sq mi (26/km )
- Time zone
- UTC−6 ( Central )
- Summer dst
- UTC−5 ( CDT )
Article
Johnson County is a county located in western portion of the U.S. state of Missouri. As of the 2020 census, the population was 54,013. Its county seat is Warrensburg. The county was formed December 13, 1834, from Lafayette County and named for Vice President Richard Mentor Johnson.
Johnson County comprises the Warrensburg Micropolitan Statistical Area, which is also included in the Kansas City-Overland Park-Kansas City, MO-KS Combined Statistical Area.